define
(    
    function()
    {
        var DocumentChangedNotification = function(documentId, changeId, changeAction)
        {            
            this.toJSON = function()
            {
                return {documentId: documentId, changeId: changeId, changeAction: changeAction};
            };
        };

        DocumentChangedNotification.prototype.id = DocumentChangedNotification.id = "DocumentChangedNotification";
        return DocumentChangedNotification;
    }
);